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Simplifying -13 + 4d = 31 Solving -13 + 4d = 31 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + 4d = 31 + 13 Combine like terms: -13 + 13 = 0 0 + 4d = 31 + 13 4d = 31 + 13 Combine like terms: 31 + 13 = 44 4d = 44 Divide each side by '4'. d = 11 Simplifying d = 11
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